Stuck caliper for sure. Go to harbor freight and buy a temperature sensing led gun. Point the gun at the brake disc and read the temp. I did a complete brake job on my 1998 Pace Arrow in 2015 after testing my brakes with the gun. Three read 150 deg. and one read 310 deg.
1998 Pace Arrow 35 ft. F53 Ford V10 2012 Honda Civic toad
32 years mechanic at Delta Air Lines 15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.